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DUTHIE, J. A., & CAMPBELL, C. L. (1991). EFFECTS OF PLANT DEBRIS ON INTENSITY OF LEAF-SPOT DISEASES, INCIDENCE OF PATHOGENS, AND GROWTH OF ALFALFA. PHYTOPATHOLOGY, 81(5), 511–517. https://doi.org/10.1094/Phyto-81-511

DUTHIE, J. A., CAMPBELL, C. L., & NELSON, L. A. (1991). EFFICIENCY OF MULTISTAGE SAMPLING FOR ESTIMATION OF INTENSITY OF LEAF-SPOT DISEASES OF ALFALFA IN FIELD EXPERIMENTS. PHYTOPATHOLOGY, 81(9), 959–964. https://doi.org/10.1094/Phyto-81-959